PROBLEM TO BE SOLVED: To obtain a structure of a rolling bearing unit with a sealing device which can prevent the generation of noise which is called as seal noise resulting from a grinding streak which is formed at an inside face in an axial direction when a tip edge of a seal lip in the axial direction slides with the inside face of a rotation-side flange in the axial direction.SOLUTION: A contact width dimension W in a radial direction of a tip edge of a seal lip 22a in an axial direction is set not smaller than two pitches of a protrusion 30a constituting a grinding streak 31 at a position in the radial direction with which the tip edge contacts out of an inside face of a rotation-side flange 10a in the axial direction. By avoiding that the tip edge of the seal lip 22a in the axial direction deeply intrudes into a recess 29a constituting the grinding streak 31a, it is prevented that vibration in the radial direction is generated at the seal lip 22a in the axial direction.SELECTED DRAWING: Figure 4
【課題】軸方向シールリップの先端縁が回転側フランジの軸方向内側面に摺接した際に、この軸方向内側面に形成された研削筋目に起因してシール鳴きと呼ばれる異音を発生させる事を防止できる、密封装置付転がり軸受ユニットの構造を実現する。【解決手段】軸方向シールリップ22aの先端縁の径方向接触幅寸法Wを、回転側フランジ10aの軸方向内側面のうち、この先端縁が摺接する径方向位置に於ける、研削筋目31aを構成する凸部30aの2ピッチ以上の大きさにする。これにより、軸方向シールリップ22aの先端縁が、研削筋目31aを構成する凹部29aの内側に深く入り込まない様にして、軸方向シールリップ22aに径方向の振動が発生するのを抑制する。【選択図】図4
SEALING DEVICE AND ROLLING BEARING UNIT WITH SEALING DEVICE
密封装置及び密封装置付転がり軸受ユニット
2017-10-05
Patent
Electronic Resource
Japanese
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